Thomas h



T. H. BLAIR. ROLL HOLDER FOR CAMERAS.

(No Model.)

No. 461,306.- Patented Oct. 13,1891.

UNITED STATES PATENT OFFICE.

THOMAS H. BLAIR, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BLAIR CAMERA COMPANY.

ROLL-HOLDER FOR CAM ERAS.

SPECIFICATION forming part of Letters Patent No. 461,306, dated October 13, 1891. Application filed July 11, 1889. Serial No. 317,142. (No model.)

To aZZ whom it may concern:

Be it known that I, THOMAS H. BLAIR, a citizen of the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Roll-Holders for Cameras,

of which the following, taken in connection with the accompanying drawings, is a specification.

This invention has for its object to provide a novel roll-holder for a camera; and it consists in the features of construction and the combination or arrangement of parts hereinafter described and claimed, reference being r 5 made to the accompanying drawings, in

which- Figure 1 represents a perspective view of the improved roll-holder,showing the hinged tension-cover as swung open and a portion of the back of the holder as broken away. Fig.

2 represents a longitudinal section of the improved roll-holder. Fig. 3 represents a detail sectional view showing the spring-pressed stop for limiting the feed of the sensitive paper. Fig. 4 represents a detail longitudinal section of the feed-roller on which the sensitive paper is wound after being exposed; and

Fig. 5 represents a cross-section on the line X X, as shown in Fig. 2.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

A represents the case or frame of the holder, having in one end a box a, in which is loosely 5 arranged or fixed on bearings the sensitivepaper reel B, as shown in Fig. 2.

a represents the removable back of the holder, and a represents the slide at the w front of it, as usual.

To the back of the reel-box a is hinged the cover 0, provided in its free end with suitable spring-catches or equivalent locking devices 0 c,by means of which the coverc is locked to the box a after the reel B of sensitive paper has been introduced into said box, as

shown in Fig. 2.

c" is a spring-pressed tension bar located in a recess in the under side of the hinged cover 0 and adapted to bear against the sensitive paper I), where it passes by the stationarybar C63, that is located in box a below the yielding tension-bar c", as shown in Fig. 2, so as to aid in holding said paper ribbon b smooth and taut within the holder.

lVithin the holder, at or near the ends thereof, are loosely journaled the guide-rollers d and d, on which is supported the endless belt or cloth D, as shown in Figs. 1 and 2. To said endless belt or cloth is secured a pair of cross bars or plates 6 6, having a series of outwardly-projecting teeth or points 9 c e, which are adapted to penetrate the paper I) and lock it to the endless cloth D, while the paper is guided on said cloth from the reelB to the roller f-,on which it is wound after being exposed. These projecting teeth or points c c 6' also serve to puncture the sensitive paper, and as the circumference of the endless belt D is made double the length of the sensitive paper desired to be exposed to the rays from the lens in the camera, and as there are two sets of these projecting points, it will be seen that they will puncture the sensitive paper at each end of the exposure. The roller fis located in journals in the sides of the box a, and provided in one end with a knob or thumb-wheel F, by means of which it can easilybe turned in the direction shown by the arrow in Fig. 2, when it is desired to feed the paper onto the said roll from the reel B. As the paper is thus fed forward the prongs or projections e e on the endless band D penetrate it, causing the paper and band to be locked together, by which the band is caused to partake of the move ment of the paper.

In combination with the endless band D and its prongs c I use an adjustable stop device for the purpose of stopping the paper after it has been moved to the proper position for exposure, and this device consists of a rod G, arranged to slide longitudinally in a recess or bore in theend of the holder A, as shown in Figs. 2 and 3, said rod being normally held in alocked position relative to the middle one of the prongs e by the influence of a suitable spring g, as shown in Fig.

g is a tooth or projection on the rod G, which serves as a stop for the middle ones of the prongs e on the band D when the paper is moved to its proper position for exposure. The rod Ghas in its outer end a knob or handle g. (Shown in Figs. 1, 2, and

The operation of the device is as follows: We will suppose that the paper (9 has been fed forward until one of the middle prongs e on the endless band D has been brought to a stop against the locking projection g on the bar or red G. Said paper While in such position is ready for exposure in a camera, as usual, by the removal of the slide a. After exposure the said slide a" is replaced, asshown in Fig. 2. Previous to making another exposure the rod G is pressed longitudinally against the yielding spring 9 until its looking projection g is moved to one side of the middle prong 6, thus liberating the latter and allowing the paper to be fed forward by turning the knob F on the roller f. As soon, however, as the middle projection c has passed by the locking projection g the operator relieves the pressure on the knob g", causing the rod G and its locking projection g to be automatically returned to its normal locked position by the influence of the spring g, and thus automatically stopping the feed of the paper when the next middle prong e reaches the stop projection g on said rod G, and so on, thus always moving the paper to its proper position within the holder for exposure.

lVhat I wish to secure by Letters Patent, and claim, is

The combination, with a case or frame having a box at one end, a movable back, and a front slide, of a horizontal box-cover carrying a spring-pressed tension-bar, a sensitive-paper reel arranged in the box, guide-rolls at the ends of the frame, an endless belt extending round the guide-ro1lers and having teeth or points to engage the sensitive paper, a rewinding-reel journaled in the box in juxtaposition to the paper-reel, a stop-rod arranged to slide longitudinally in one end of the frame and havinga tooth or projection to act on the teeth or points of the belt, and a spring which normally presses the stop-rod in an outward direction, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence oftwo subscribing witnesses, on this 28th day of June, A. D. 1889.

THOMAS H. BLAIR.

Witnesses:

ALBAN ANDREN, MATTIE J. JACKSON. 

